text: /*
    Teem: Tools to process and visualize scientific data and images              
    Copyright (C) 2008, 2007, 2006, 2005  Gordon Kindlmann
    Copyright (C) 2004, 2003, 2002, 2001, 2000, 1999, 1998  University of Utah
  
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public License
    (LGPL) as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.
    The terms of redistributing and/or modifying this software also
    include exceptions to the LGPL that facilitate static linking.
  
    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.
  
    You should have received a copy of the GNU Lesser General Public License
    along with this library; if not, write to Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
  
  #include "ten.h"
  #include "privateTen.h"
  
  #define INFO "Scale the anisotropic component of the tensors"
  char *_tend_anscaleInfoL =
    (INFO
     ". This maintains the isotropic component of the tensor, and fixes "
     "either the trace or determinant, "
     "while scaling up (or down) the \"deviatoric\" component "
     "of the tensor.  Good for exaggerating the shape of nearly isotropic "
     "tensors.");
  
  int
  tend_anscaleMain(int argc, const char **argv, char *me, hestParm *hparm) {
    int pret;
    hestOpt *hopt = NULL;
    char *perr, *err;
    airArray *mop;
  
    Nrrd *nin, *nout;
    char *outS;
    float scale;
    int fixDet, makePositive;
    
    hestOptAdd(&hopt, "s", "scale", airTypeFloat, 1, 1, &scale, NULL,
               "Amount by which to scale deviatoric component of tensor.");
    hestOptAdd(&hopt, "fd", NULL, airTypeInt, 0, 0, &fixDet, NULL,
               "instead of fixing the per-sample trace (the default), fix the "
               "determinant (ellipsoid volume)");
    hestOptAdd(&hopt, "mp", NULL, airTypeInt, 0, 0, &makePositive, NULL,
               "after changing the eigenvalues of the tensor, enforce their "
               "non-negative-ness.  By default, no such constraint is imposed.");
    hestOptAdd(&hopt, "i", "nin", airTypeOther, 1, 1, &nin, "-",
               "input diffusion tensor volume", NULL, NULL, nrrdHestNrrd);
    hestOptAdd(&hopt, "o", "nout", airTypeString, 1, 1, &outS, "-",
               "output image (floating point)");
  
    mop = airMopNew();
    airMopAdd(mop, hopt, (airMopper)hestOptFree, airMopAlways);
    USAGE(_tend_anscaleInfoL);
    PARSE();
    airMopAdd(mop, hopt, (airMopper)hestParseFree, airMopAlways);
  
    nout = nrrdNew();
    airMopAdd(mop, nout, (airMopper)nrrdNuke, airMopAlways);
    if (tenAnisoScale(nout, nin, scale, fixDet, makePositive)) {
      airMopAdd(mop, err=biffGetDone(TEN), airFree, airMopAlways);
      fprintf(stderr, "%s: trouble:\n%s\n", me, err);
      airMopError(mop); return 1;
    }
    if (nrrdSave(outS, nout, NULL)) {
      airMopAdd(mop, err=biffGetDone(NRRD), airFree, airMopAlways);
      fprintf(stderr, "%s: trouble writing:\n%s\n", me, err);
      airMopError(mop); return 1;
    }
  
    airMopOkay(mop);
    return 0;
  }
  TEND_CMD(anscale, INFO);
  